Is there a mod that checks if a plantsim is married before making a plantbaby and makes the spouse adopt the plantbaby as the second parent?

Haven't heard of those, but you should get a similar effect with midgethetree's hereditary supernaturalism mod: https://midgethetree.tumblr.com/pos...ernaturalism-v2

That way, a child of a plantsim and a human would have a 50 % chance of also being a plantsim (lifestate changes when becoming a toddler, since there is no baby lifestate for plantsims).

You can have them adopt it after the fact with the Sim Blender. It won't satisfy the "have a baby" want for them, but I don't think the plantbaby satisfies that want for the actual parent, either.

It actually does lol!
I do use sim blender right now, but I was wondering if there was a better way. If I could code I would probably make a mod but sadly I'm not that good.

The issue is the interface, mostly. You'd probably have to launch a dialog to choose the second parent, and then you'd have to choose who to allow in the dialog, etc.

Wouldn't it be possible to simply do a check?
If the Sim is married, use the spouse as the parent.
If the sim is not married, use ideal plantsim as the parent.

Not really. The sim could not actually be married to whoever you wanted to use as the second parent, they could be married to multiple people, etc. Ideal plantsim never appears as the parent of a plantbaby, regardless.

@kestrellyn Would Name the Father work?

https://modthesims.info/d/636945/name-the-father.html

I thought abot that, but PlantBaby generation does not involve a pregnacy state.
Although the concept is very similar, as I would like to name the plantaby's other parent as this mod does.

What about an interaction like "Propose.../Have a plantbaby together" that pops up in the menu with the same relationship requirements of a "Try for a baby"?
If the other sim accepts, the plantsim then proceeds to sporulate the new baby.
The baby still gets the same genetics of Ideal Plantsim but the second sim also gets named as the parent of the new baby.

EDIT:
The plantsim that makes the baby would still get the "Produced Spore" memory while the other parent would get the "Adopted a child" memory

Name the Father works by setting up a token before birth so that when the birth happens the correct parent is assigned. The plantbaby spawn happens as a single action, I don't think it makes sense to set up a token beforehand and then do the singular action, when you could just do everything in the same action. If you mean, use the same list of sims that Name the Father uses, it also includes e.g. sims that the pregnant sim has woohooed, which might not be super relevant to plantbaby spawning. Like I said, it's mainly a question of deciding which sims it makes sense to include in the dialog.

Does it matter whether or not they show up on the family tree, or do you just want them to be treated as family? https://modthesims.info/d/620238/found-family.html

I'd really like for them to show up on family tree.

If you adopt them with the sim blender, they will show up on the family tree and be considered children for the purposes of all wants, etc. including the "have X children" wants as long as the final child that triggers the want is gained by regular in-game means.