Unconditional love

I have been thinking about this a lot lately. I felt this for toad and believe that i forgave most of his crap treatment of me because of this. I have never felt this type of love for anyone outside of blood relatives, and never a man, So what is confusing me is, if my son, sister, brother were to treat me as badly, i would still love them dearly, but would i disown them like i have had to with toad? I find it hard to believe i would. Im not, of course, saying im prepared to put up with crap just because im related to that person, but how hard would it be to disown a family member in the same way as the narc.?
Anyone else thought about this?
x