A common cause of relationship and family problems is money. Even if you get along well with others, friction can still exist if there is a financial aspect to an issue (more often due to lack of money). In fact, a lot of issues in the world are money problems.
But there are problems that are not about money. If you or a loved one got afflicted with a disease that has no cure, no amount of money can afford you the medicine, as it doesn’t exist (yet). Once you lose your family or friends, they cannot be brought back regardless of your wealth. If your relationship with someone reaches a breaking point, money alone cannot get it back to the way it were.