So like Lawrence is about to toss himself off the roof, and of course Lydia stops him and tries to get him to summon her.

And what if the Maitlands show up, maybe feeling bad for Lawrence because he's clearly a wreck, and try to warn him that Lydia is up to no good.

But Lawrence doesn't listen to either of them, and just goes back downstairs, where he finds that his mother had copied his house key and is trying to force him to let her move in with him.

So he tries to enlist the Maitlands' help to scare her out (Enter the day-o scene), but it doesn't work

So he summons Lydia to get rid of his mom, which DOES work

And then they go on a haunting spree, scaring the hell out of anyone that comes to the house. But Lawrence is still depressed and still wants to off himself. Maybe even more now, after seeing what the afterlife has to offer. This makes Lydia mad because she won't have anyone to talk to if he dies.

Also, I don't know how you feel about the whole wedding part. I'll leave that up to you lol