My brother a stock broker for 30 yrs just put my 90 yr old dad in a $800 k 5 yr annuity with Symetra . It was paying 5.2%. The reason my dad did is to leave $200 k to each grandkid on death . My brother said there very safe company. My dad didn’t want to do cd’s as he’d have to pay taxes yearly and he’s in the highest 37% tax bracket . Are they safe ?