Which is why Carlton always mentions that he hasn't revised his will whenever there is the slightest chance of Phil dying when resolving an episode's conflict.
- This is Jossed I think in one episode. When Carlton learns he's about to get a baby brother, he complains about having to split the inheritance four ways. If Will was in the will, they would have to split it five ways. Of course Phil could have changed his will again in a later episode
The opening credits decribe Will getting "in one little fight" (against several, larger guys) in the rough neighborhood he grew up in. This results in a coma, wherein he dreams about a life far removed from the urban hell of West Philadelphia in the 90's.
(Note: this theory was originally from this BuzzFeed article)
Will actually died in the fight on the basketball court in West Philly. The taxi driver is actually God, who drives a "rare" cab. He takes Will to heaven, where he works out all his issues with his wealthy Aunt and Uncle. Will only sees his mother and father on special occasions, because that's when they come to visit his grave.
At the end of Papa's Got A Brand New Excuse, Will's Father claims he has been offered a job that would put him on the road for lengths of time and would have to cancel the cross country trip Will had been hoping for. The problem is, there wasn't any. He was just making it up so he wouldn't have to tell Will he was leaving again. Considering he never said what he was doing or who he was going to be working for. He made that up as an excuse cause he refuses to accept responsibility for what happened to Will due to him walking out when he was a kid and cause him to be a slightly troubled teenager growing up.
- Pretty sure this was the intended subtext of the scene - that Will's father was flaking out over having to take responsibility for his son or at the very least, being involved in his son's life.
Considering they have the same skin tone and Will doesn't look anything like his real Dad I wouldn't be surprised if Phil and Will's mother had a one night stand before he was introduced to Vivian that left her pregnant and he never knew and she didn't tell anybody.
- Isn't Hilary older than Will? That would mean that Phil cheated on Vivian with her sister. Maybe Will's mother wanted to have a child but his father didn't so she got pregnant by Phil using artificial insemination. Will's father left when he found out what she did.