The total amount of money Mr. Eithan gave to his wife is 2/5*2000 = $<<2/5*2000=800>>800
After giving his wife $800, he remained with $2000-$800=$<<2000-800=1200>>1200
He gave his first son 2/5 of the remaining amount which is 2/5*$1200 = $<<2/5*1200=480>>480
The total amount remaining after he gave his first 2/5 of the amount is $1200-$480 = $<<1200-480=720>>720
He then gave his second son 40/100*720 = $<<40/100*720=288>>288 of the money.
After giving his second son $288, the amount of money remaining that he saved in the family's saving account is $720-$288=$432
#### 432