Future mother in law πŸ˜•

Me and my boyfriend (21) are in a strong relationship and do plan on having a future together! 
His mum is very controlling of him, he's said its just an african parent thing πŸ™„πŸ˜’ she said to him before that she wouldnt love his children as much as his sisters children .. Which to me isnt nice! 
Has anyone else got annoying/horrible step parents?