I have three biracial daughters and I was constantly encouraged to perm their hair by their father's family... So I did. I have since learned better and they are all natural, however, when they were relaxed I still had to take a straighten iron to it because it always ended up having an weird wave pattern. I complete understand the unsupportive family. My mother as well as their dads family think I am crazy for not relaxing their hair. I don't have much support from either side, but I know what is best for my kids, so their opinions don't matter much to me.
My mother is another issue, she has always tried to be "in my business". But as I said her opinion doesn't matter, but it doesn't stop her from stating it.