Are you currently planning for their future?
Yes, I am
then you can rest assured that they will receive Social Security help if you manage to earn enough social security benefits through your work.
would my wive get the benefits regardless of her age?
She would get the benefit no matter her age if she's disabled or it's still taking care of your child who is 16 years old or younger.
what's the minimum amount of credits needed for my wife to get the benefits while she's still taking care of my tuner age children?
you'd need to sum at least 6 credits in the three years just before your death
what if the amount my family members get paid is higher than the limits?
Then the benefits would be reduced proportionately. Benefits for disabled surviving spouse won't count for the maximum amount.
and what if my widow remarries after turning 60?