MIL keeps asking to babysit DS, he is 5 months old. She isn't in the best of health and DS can be a handful. She has COPD and suffers back spasms to the point where she claim she isn't fit enough to go a 5 minute walk to the shops. DS isn't a great sleeper and become fussy and unsettled on regular basis due to being overtired. He doesn't settle unless he is being held, I spend most of my day walking about with him and with her breathing difficulties and bad back I don't think she'd cope. I have tried letting MIL spend time with DS while I'm there so he gets used to her but after 5-10 minutes of him fussing she hands him back to me. I'm not comfortable leaving DS until I know MIL changed him, wind him, change his nappy, and settle him. DH is of the opinion I should just let MIL have DS on her own and if she can't cope I should go and collect him but I'd rather know he's in capable hands before I leave. This has caused a few arguments between me and DH, am I being unreasonable, should I just do what DH is suggesting?