Would you let your LO co-sleep (co-bed) for naps with Grandparents? My LO is 5 months old and is being watched by my MIL who is visiting us. I just started work and came home one evening to find them both asleep in my MIL's room. I was not too thrilled with this especially since we didn't discuss this and I don't know if MIL is being safe with her co-sleeping (keeping pillows, blankets, etc. away from LO's face).

I feel really uneasy with this but am I just overreacting? Would you allow your LO to co-sleep with Grandparents? If not, how should I discuss this with her?