Similarly to diam, my MIL was diagnosed with advanced cancer. We had one very young son at the time and I was expecting our second. DH and his family rotated nights caring for MIL and bringing meals. I cooked meals often for him to bring over, just emotionally supported him and let him know he should spend as much time with her as he could. I was the primary caregiver for DS during that month. Since DH is one of five siblings (and MIL had siblings as well involved in her care), I stayed out of the decision making and discussions (and I got the feeling they only wanted it to be the "inner circle").
I'm so sorry to hear about this and I will pray for your family and MIL.