Marvin and Trina’s weird second child no one talks abt (falsettos/in trousers)

I rewatched the in trousers  and I realized that there’s a lyric in “your lips and me” that implies that Marvin and Trina has a second child ( “the baby is crying on the swing set, the oldest is kicking ass) and someone on tumblr (I don’t remember the exact user) say that it’s implied again that Marvin has another child with Trina because of the lyric in falsettoland that introduced him as father with children, children being multiple; and maybe I’m looking too deep into this but if It was just a recon then why is it still a lyric in falsettoland that is written way after In trousers. Now that I think about it they probably just kept it in because it fit lyrically but still where is this mystery child? I personally think it was in there because of the whole tight knit family thing because when I think an old fashioned traditional I think of neuclear families (mother, father, son, daughter) but he just got rid of them for motf/falsettoland 

and the second kid was probably in the original in trousers production and at least to my knowledge that’s lost media so the world will probably never know who is Marvin and Trina’s second mystery baby is, someone please ask William Finn about this in an interview please I need to know.

(I also didn’t really know how to add this but it’s also implied Marvin and Trina had a shotgun wedding meaning they didn’t really want a kid to begin with and there relationship was already kinda fucked from the beginning so I don’t think it would make sense to have another kid but also if that’s the case why keep the father with children lyric in there????)