US Social Security survivor benefits?

I know my Thai wife needs to be in the US for 5 years before obtaining the ability to get my benefits if I die, but does our child who has US Consular Birth Abroad and a SSN have to be in the US for 5 years? Or is that just for children who don't have the US Consular Birth Abroad Certificate and SSN?

Also, if my wife is in the US for the full 5 years and is eligible for survivor benefits, and say we return to Thailand, is she also eligible for Social Security Spousal Benefits based on my SS? I am thinking we would have to stay in the US for her to receive spousal benefits on my SS, but not sure.