So basically, I have alot of speculations on what is going on in this Manga. I have some conclusions while proceeding to read this Manga and this is what I came up with:
We all know that the daughter and mother is suspicious and has intention to our guy, and basically the mother has a condition of not being able to give birth so that's why the mother and daughter came up with a solution for it, and that's making the daughter pregnant by our guy (They're making him frustrated on making a child and since the mother can't bear one, he can only make one with his daughter). I was confused at this point, questioning why would they do this? Where is this going? And then I saw a chapter where the mother and daughter are in sort of a restaurant where they're having a talk, basically about our guy, but what makes things more difficult is that the ice cream that they ordered for someone, and that's the biological father of the daughter and the mother's first husband. Do you guys get it? Why did she say that to the first husband/biological father to wait a little bit longer? What are they up to?
1st Conclusion: At this point I really don't know what's happening but probably, the first husband/biological father can't make a child and also alive, so as the mother, and another question popped up again: Why would the daughter be responsible of having the child of our guy?
2nd Conclusion: This is just messed up and guess what, since the mother can't bear the child and felt like she's at fault, maybe she came up and just bear the child with her own daughter instead and guess what, another question: Why did the daughter say to her biological father/first husband to wait a bit longer?
3rd Conclusion: As of now I also think that I was wrong, maybe the daughter is referring about our guy (Not the biological father/first husband) in the restaurant and the the 2nd Conclusion is at best if this is fact, BUT offering an ice cream to someone that's not there is questionable also (The title itself makes it.
4th Conclusion: The mother is just helping her daughter have a child? No, that's absolute nonsense, she should've just gotten in a relationship with someone else.
5th Conclusion: In this one they're basically bringing back the first husband back to life and with that maybe there's a specific requirement for it (Our guy and the first husband's feature looked the same, no?). So maybe that's why they chose him, the title itself "Welcome Back, Papa" just supports this conclusion and the our guy's name being circled in a paper right (Basically means he's the target).
Note: I made this when Chapters are at 27 only