When Leo and Piper went to a marriage counselor. They cast a spell to make them remember all the things from the past that they did together. Phoebe and Paige get transported to all of Leo and Piper's memories and they were able to see among other things their first kiss.
In "A Paige From The Past" when Paige gives a speech to her parents in the past trying to convince them that she will amount to something and when her mother says that she knows Paige will find herself one day. In the car before they crash and die they have a normal family conversation about the mother's cooking which you just know they haven't had for a while. Also at the end of the episode when their ghosts tell Paige they're proud of her.
Season two's "Morality Bites" shows Phoebe witnessing a premonition of her own death ten years into the future so the sisters travel forward in time. Phoebe eventually discovers that her future self murdered a man for revenge and was outed as a witch so she was sentenced to death. At the end when Piper and Prue try to save her Phoebe stops them and says she has to die. She then allows herself to be burned alive while her sisters watch in despair before finding themselves back in the present.
The second part of the fifth season premier shows Piper drowning and an apparition of her mother appears to help her out of the water. Paige and Leo then tell her she won't be raising her child alone. Also the very end montage of the episode with B* Witched's "Blame It on the Weatherman" playing shows Paige packing up her stuff as she leaves her job to focus on helping innocents more, Phoebe signing divorce papers for her marriage to Cole and Piper putting a picture of herself as a baby with her own mother in a photo album for her baby. The baby in her womb uses its magic to spell out the words "Grandma and Mommy" on the page.
Although Billie Jenkins was considered The Wesley in the show she managed to have a Crowning Moment of Heartwarming at the end of "The Lost Picture Show" which had her falling for a man from the 1950s. He was killed by a demon and the end shows Billie laying a rose on his grave. Say what you will about Kaley Cuoco's crying but her expression in that scene was perfect. Oh and just as the camera fades out you hear a slight jingling which hints that the man may have become a whitelighter.
At the end of "Long Live the Queen" after Phoebe has just had to kill Cole Piper and Paige go up to her room where she is lying on the bed crying. Piper lies down next to her and Paige pauses before lying down too. Paige and Phoebe have had their differences before but they are forgotten in this moment.
In the second season premiere Prue suffers a breakdown because of Andy's death, feeling responsible for it. One scene had Piper and Phoebe comforting her.
Phoebe: He chose to walk through that door not because of who you were but because of who he was.
Piper:' A protector of the innocent, just like us.
The end of "Hell Hath No Fury" where Piper goes into Paige's office to have a chat. Paige's boss comes over to them and asks who Piper is. Piper replies "I'm her sister". Piper had spent the last episodes acting cold and hostile towards her half-sister Paige because she saw her as a "replacement" for her beloved big sister Prue.