Photo: Jackson Laizure/Getty Images Moneywise and Yahoo Finance LLC may earn commission or revenue through links in the content below. American baby boomers are expected to pass on an astronomical $84 trillion in inheritances to their heirs over the next 20 years in what’s being dubbed “the great wealth transfer.” However, offering monetary gifts to adult kids can be tricky. On the one hand, many parents likely want to do everything they can to provide their kids an advantage in this inhospitable econom ...