If there is a deadbeat bio dad and mom has married when girl is 17 it is highly unlikely she was a SAHM. Quite possibly they have kept separate finances.I took it that way too, but the point can be made that if she is a stay at home wife, she could be acknowledging the fact that He is the bread winner and it really is his money that is paying for the dress.
Which begs the question...If this is true what obligation does he really have to spend any of it on the dress? Not his kid, is not a household expense, not even a shared vacation cost.
I agree with the advice. Given the bio dad's history unless he has completely turned his life around, I have doubts he will pay for his half of the dress and may even trash the wedding somehow. Note that the daughter found him rather than bio dad seeking out the daughter.
One role is for LW to walk his wife down the aisle.
A lot depends on the quality of his relationship with his stepdaughter but it does not sound as affectionate as it might be.
Cynical note: since the bride is romanticizing her relationship with her bio-dad, she may be doing so with the groom. LW can walk her down the aisle at her next wedding.
L2 Any bets that the shy LW is really teh same person who wrote to Abby?