What has been dubbed simply "The Road Scene" in episode 2x08. Dr Turner finds ex-Sister Bernadette on the side of the road after she has been released from the sanatorium. Since she's no longer a nun, they are now free to act on their feelings for each other. And they do. Magnificently. Keep in mind, the dialogue below is said during a Held Gaze after he's wrapped her up in his coat and is laden with months, if not years, of unspoken love between them.
Dr Turner: What if it had started raining? What if you'd got lost?
Sister Bernadette: I was lost. I got the wrong bus.
Dr Turner: I was on the right road.
Sister Bernadette: Yes. [deep breath] I know you so little but I couldn't be more certain.
Dr Turner: I am completely certain. And I don't even know your name!
Sister Bernadette: [beaming from ear to ear] Shelagh.
Dr Turner: [tenderly] Patrick.
Sister Bernadette: There. We've made a start.
In episode 2x05, Nora, the older woman who got pregnant after she'd already had eight children, survives falling into a coma and finally gets to move her family into a bigger home. And it's out in the country! It's at first implied that she'd died, but it turns out to be a bait-and-switch and we see her strolling through a field with her family.
After Chummy helps Fred's daughter Dolly give birth to her second born, Fred has a moment where he explains to her about how he grew up so poor that he didn't own shoes. He promised that his own children would grow up with shoes, hot dinners, and a happy home. "And I managed all three." He also states that his biggest regret was not being there for his family during the London Blitz and that being a good parent is all about being there for them. Chummy is touched by his words so much that she names her baby boy after him.
Chummy and Peter's relationship, full-stop.
Six words: "Please will you marry my dad?"
In the second season finale, Jimmy tells Jenny about his baby daughter, and how even though it's more exhausting than he expected to care for her, he loves her very much. There's also his obvious desire to see that Jenny is happy and not pining away for him, even though he already confessed his love to her earlier.
When Winnie gives birth, it's immediately obvious that her husband Ted is not the father of her son. The midwives, Dr Turner and Winnie herself are naturally expecting (and dreading) that Ted will be furious, but to their astonishment and joy Ted immediately accepts the baby and proves to be a loving and devoted parent.
The Reverend Appleby-Thornton's explanation for his constant chatter, which is also something of a Tear Jerker:
It was in the silences at the dinner table that I felt my parents' hatred for each other. So I became accustomed to filling them. [...} I talk so I won't know what the silence holds.
The relationship between Sister Bernadette and Sister Julienne is absolutely full of them.
When young Timmy Turner is struck down with polio, Shelagh is not allowed to stay with him at the hospital because she hasn't yet married his father and she's not his biological mother. Also, she's been avoiding all of Nonnatus because she's afraid of what they'll think of her for leaving the Order, but in that moment of crisis she goes back to the place that has always been her sanctuary, joining the nuns' plainsong during their evening service and quietly slipping her hand into Sister Julienne's as she joins them in song. Later, as Julienne is tenderly tucking her into her makeshift cot:
Julienne: Did you believe for one moment that we wouldn't want you here tonight? That we wouldn't welcome you with open arms?
Shelagh: I turned my back on you, Sister. I walked away. I became someone else.
Julienne: No, you didn't, Shelagh. You found joy — and I've never questioned it.
Shelagh: [brokenly] But there's no joy now.
Julienne: But there is love — and it's Christmas. Have courage.
[Julienne holds Shelagh as she cries]
Julienne's words when she asks Julienne to give her away at her wedding:
Shelagh: You should be giving me away. You should be walking with me.
Julienne: [visibly struggling not to cry] You belong to no one but yourself — and you know exactly where you're going.
When Shelagh walks down the aisle to marry Dr Turner, Julienne is sitting in the front row of the left side of the church, in the seat closest to the centre aisle — the place traditionally reserved for the mother of the bride.
The 2014 Christmas special reveals the Turners' adopted daughter's full name: Angela Julienne Turner.
In episode 4x02, Sister Julienne is confronted with the memory of the potential love match she turned away from in order to follow her calling as a nun — an almost eerie mirror to Shelagh, who left the Order to follow her calling as a wife and mother. Deeply shaken and struggling with her own feelings, she can go to only one person. This relationship is definitely not one-sided.
Julienne: [to Shelagh] Who could I turn to, if not you? Who would console me, if not you?
After obtaining a hearing aid for Crazy Cat Lady Mrs. Jenkins in the first Christmas special, Dr Turner whispers "Merry Christmas" in her ear. The look of utter wonder on her face, when she probably has been going deaf for several years, is wonderful.
The end of episode 2x2, when Peter gathers all the Cub Scouts, midwives, and Sisters to serenade Chummy with their song "You Are My Special Angel" before they leave for Sierra Leone, where Chummy spends six months as a missionary.
Douglas Roberts, in season 2, deciding that he was going to keep his son, born with spina bifida and convincing his wife to agree with him by making her realize how much she loves the baby.
Also, her picking up her son after refusing to do so the whole episode.
Ruby Douglas: He's not an it, he's a baby. He's my baby boy.
In series 4, Patrick Turner battles a rather serious case of recurring PTSD brought on by his service in World War II — PTSD which had, in the past, sent him into a full-fledged breakdown which ended with him in a mental hospital. When he finally recovers from his depression, he admits to his wife Shelagh that he had been terrified he was going to have a second. Shelagh assures him that they're not at war any more, and it won't happen again. Patrick's response?
Patrick: I know. Because I have you.
From the 2015 Christmas Special, Iris and her husband in the hospital as Iris gives birth to their very unexpected second child, 22 years after they lost their first. The emotion that Iris' actress puts into her realization - the fear, the hope - and then her husband's hand shaking too much to even hold a cigarette...and then the baby arrives.