How can you tell who are related when trying to make babies?

I noticed that a lot of times I have pairings that will start talking and say something like "Nothing like hanging out with families."
How can I tell who are related other than dropping them into the room and wait for them to start talking?
Best Answer
There's the obvious of them having the same last name, but besides that if they're both in the bedroom and they're related they say something like"there's nothing like hanging out with family", instead of the usual pick up lines.
These are the only ways of knowing.
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Which parent determines the gender of the offspring?
What we can say is that dad's sperm determines whether a baby will be born as a boy or a girl. About half of his sperm will make a boy and half a girl. The sex of the baby depends on which sperm gets to the egg first.What happens if you get pregnant by your cousin?
The vast majority of children of first cousins are healthy and do not have problems due to their parents' relatedness. It is important to keep in mind that even for an unrelated couple, there is an approximately 2-3% chance that their child is born with a birth defect, genetic syndrome, or disability.What happens if blood relatives have a baby?
When parents are blood relatives, there is a higher risk of disease and birth defects, stillbirths, infant mortality and a shorter life expectancy. To have a child with severe diseases and disorders may cause heavy strain for the family in question.What is it called when family members have a baby?
Consanguinity is defined as \u201cgenetic relatedness between individuals descended from at least one common ancestor.\u201d (1) Put more simply, consanguinity means two individuals are \u201cblood relatives\u201d or \u201cbiological relatives.\u201d We often receive information and questions regarding a child from a union of two related ...11 Signs You’re Finally Ready to Have a Kid
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Answer 2
You could devise a naming scheme that would allow you to track genealogy (you can rename when a baby is born). A simple scheme might have woman A and man B, whos kids are AB1, AB2, etc. This type of scheme might only work for a few generations though. This is just an example; I realize there are some flaws with it that might prevent it from working.
It might be helpful to know if members of the same tree can ever start mating again.
Answer 3
Check the dwellers' conversation when you assign them to the living quarters. If they say, "There's nothing like hanging out with family," they're either parent/child or siblings.
To avoid this, I name my dwellers with the last name of the opposite gender parent, with a numeric generational tag. So if Jane Doe and John Smith have a girl, I assign the last name as Smith-2. If it's a boy, the last name would be Doe-2.
The only flaw in this system is if the same set of parents have two opposite gender siblings.
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