He lost a fortune in a bad stock deal, so his family was strapped for cash.
この場合、次のような言い方ができますよ。
ーHe lost a fortune in a bad stock deal, so his family was strapped for cash.
「彼は株取引で大損をし、家計は火の車だ」
to lose a fortune in a bad stock deal で「株取引で大損をする」
to be strapped for cash で「火の車である」
ご参考まで!