Got ilr on 10 year long residence and dependent visas

I was on on tier 1 general and I got ilr on 10 year long resident.
My Question is about my husband visa.
He got his tier 1 dependent Visa in 2011.
After my ilr he switch to FLR (m).
When he can apply his ilr.
My second Question is about my over 18 son.
My two younger children git ilr but my over 18 children visa refused two time.
Now again I applied on FLR (O).
I am divorced and have sole responsibility of my children. They came UK in 2013.
Please some senior members Help me.
I will be very thank full to you all.

I am new to this site and I don't know where I post my Question. So thats why I posted my Question on diffrent topics.

Please can some one give me answer of my questions.
Many thanks

Please can somebody any advice