He (or she) can be. The same-sex spouse of your sibling is your in-law. Likewise, the parents and siblings of your same-sex spouse are considered in-laws.
no
The Inlaw Josie Wales was created in 2000.
Inlaw
grandma inlaw
jarasandh
Certainly they can.
She's not available.
Princess catherine (sister-inlaw)
I don't think you can. You either has to be single or married to adopt. Just living together is neither. if you are in a samesex relationship and has gone through partnership might be possible though.
1980
great uncle inlaw
Princess catherine (sister-inlaw)