Benefiting from a parent's fame, position, or connections (implying the benefit may not reflect the person's own merit).
あの俳優は親の七光りだと言う人もいるが、演技は評価されている。
Some say that actor rides on his parent's coattails, but his acting is being praised.
会社に入ったのは親の七光りだと噂されたが、彼はすぐに実力を示した。
There were rumors he got into the company because of his parent's influence, but he soon proved his ability.
親の七光りで地位を得ても、長く続くのは難しい。
Even if you gain a position through a parent's influence, it's hard to keep it for long.