ねだ強請nedaru
1.

To demand or request something from someone by exploiting their goodwill or affection, often by being persistent or insistent.

2.

To pressure someone into giving, particularly through intimidation or manipulation, often involving financial demands or coercion.

3.

To express grievances or complaints in a needling manner, often as a means to extract something from another person.

Example:

彼は父にねだってとうとう新車を買ってもらった。

ゆす強請yusuru
1.

To make an insistent request or plea for something, often relying on the goodwill or affection of the other party, particularly when such a request is not typically granted by normal means.

2.

To coercively extract money or valuables from someone by using threats or exploiting their weaknesses, thereby forcing compliance.

3.

To complain or voice grievances in a manner that pressures someone to fulfill a demand, often in a persistent or persistently dissatisfied manner.