可愛がる
1
to be affectionate to;to treat tenderly;to dote on;to show one's love (for);to cherish
ケンは１人息子なので、父親は一層可愛がった。
Ken's father loved Ken all the more because he was his only son.
2
to show favouritism to;to be partial to
3
to fondle;to caress;to pet
4
to be tough on;to be rough with;to torment;to train harshly
used ironically; often as 可愛がってやる