In-Laws Brushed Off TDap

My husband asked my In-Laws to get the TDAP before the new baby comes and they brushed it off. They just have him a thumbs up 👍 through text. Baby will be here next week and they are expecting to see him.....

I’m a FTM, so I have not dealt with pesky family members with a baby in the mix yet. I don’t want my baby around people without their TDAPs. There’s a whooping cough outbreak where we live. Advice?