If parents interfere too much with their children's lives, it lessens their independence.
この場合、次のような言い方ができますよ。
ーIf parents interfere too much with their children's lives, it lessens their independence.
「親が子供の生活に干渉しすぎると、子供の主体性が弱まる」
to interfere「干渉する」
to lessen one's independence「人の主体性が弱まる」
ご参考まで!