Well it's not as if they APPROVED of Andromeda's marriage. You'll note she's dead now, her husband too. By rights they should have been allowed to live quietly if her husband surrendered his wand, and they weren't.
Miss Tonks is seven years older than us. So she was probably born in 1973. The war was in the early 1980s and Sirius couldn't have been a traitor before the war because there wasn't a Lord Protector to be a traitor to. So Andromeda Black must have married a muggleborn way before Sirius Black was officially a traitor but he might have had the idea before she did. Hard to go ask, though.
Re: I Solemnly Swear That I Am Up To No Good
Miss Tonks is seven years older than us. So she was probably born in 1973. The war was in the early 1980s and Sirius couldn't have been a traitor before the war because there wasn't a Lord Protector to be a traitor to. So Andromeda Black must have married a muggleborn way before Sirius Black was officially a traitor but he might have had the idea before she did. Hard to go ask, though.