PoR was great in that you could play with a variety of whips again, but if you didn't like whips, you could pretend you were Alucard.
Other Belmonts have wives if you look at non-canon sources, such as Haunted Castle or the Simon's Quest children's novel for Simon and the Belmont Legacy for Christopher (Lydie for Juste is just speculation). I wonder if Julius gets a wife in that novel they made??
Belmonts should really make sure they take the time to have children first before venturing into the castle though, just in case... But I suppose if they fail, their kids are as good as dead anyways.