I'm an only child so I can have my parents all to myself.
I don't have any brothers or sisters so I can have all my parents' attention to myself.
ーI'm an only child so I can have my parents all to myself.
「一人っ子だから両親を独り占めできる。」
an only child で「一人っ子」
have ... all to myself で「独り占めできる」
ーI don't have any brothers or sisters so I can have all my parents' attention to myself.
「兄妹がいないので両親の注目を私だけに集められる。」
「一人っ子」は don't have any brothers or sisters とも言えます。
have all attention to myself で「注目を私だけに集める」=「独り占めできる」のようにも言えます。
ご参考まで!