Question about marriage

I was worried if he will disappear from my family tree but I guess since I already have kids from that sim, he should be still visible on the family tree. 

Thank you!

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@TomSpeedy180 wrote:

@jiwon4826

If you allow your sim to join their household, you will lose control of that sim, but you will get an heirloom as if your sim has retired. The other player then has control over your sim. 

Will they be gone from your family tree? Well, you wont be able to control them anymore so you wont be able to have kids with them. However, if you already have kids with that sim, then they will still remember your sim as part of the family tree. 

Here are more details: http://simsmobile.gamea.co/c/jwsd3d0x

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They will not disappear from your family tree.  If you click on your family portrait and then use the past generations button to get to the appropriate page, you will still see them in your family tree.  They will appear young until the person who received your sim retires them and they it will appear just as any of your other retired sims appear.

I have given several sims to other players and all of them are still in my family tree.