I'm pretty sure you have to pay to combine with BA unless you're gold or something? Either way if you do combine them you can transfer to your account no worries.

​​​​​​BA offers a household account where you can pay with yours and your households avios for redemptions, I use this frequently to use my wife's QR avios after transferring to BA.

QR doesn't let you combine avios, it will just give you a percentage of your family members' new accruals depending on your tier.