For one thing, where'd you get the idea that most kids in the Trek universe have single parents? That's ludicrous.
I don't mean most characters, I literally mean most kids - that is, characters who are underage
during their Trek appearances. For TNG, we have Wesley, Alexander, Jeremy Aster, Clara Sutter, and each and every one of the kids in "When the Bough Breaks" (or did the other parent from each family have something better to do than attend Picard's briefing?). For DS9, we have both Jake and Nog, although the latter isn't particularly relevant to the argument. VOY's Naomi Wildman is as good as fatherless, and for all appearances is motherless as well (at times, it's difficult to tell whether Ma Wildman is still aboard or not).
Basically the only exception to that rule in TNG is Molly O'Brien; DS9 adds Kirayoshi O'Brien. And VOY inserts the Paris-Torres baby literally at the last moment.
Perhaps this is something endemic to "quarterdeck breed" only, but this suffices perfectly for my argument about kids aboard starships. That Picard had a wholesome childhood is not relevant because he wasn't aboard a starship. And of the other characters, only LaForge is ever established as having a "full" Starfleet family; Janeway has a father in Starfleet. All other heroes are basically presented as Starfleet virgins, often joining against family wishes like Picard and O'Brien did.
FWIW, the "Starfleet brat" LaForge also indicates in TNG "Interface" that he would only spend time with one parent at a time... Goes with the territory, I guess.
Timo Saloniemi