seriously need some advice

TT

My fiancés mother just got cancer for the second time and was told only has 2 years to live. We have kids a 6 year old and a 6 month old. I am not close with her and had issues in the past. So to cut it short my fiancé brought up if she’s getting really sick he wants her to come stay with us and I don’t want to sound mean but I’m really concerned about what my 6 year old will be witnessing or seeing if she were to stay, we’ve already been through something traumatic in our lives involving her and now this my children mainly my 6 year old is my main priority I know I can’t not protect him from the world but I dont want him to see first hand neither. I just responded with well wouldn’t she be at a hospital ? Because I don’t want my son to see her die. This is such a heavy and hard discussion to have with your partner so I’m just treading very lightly. I am sad and concerned already because my child is going to lose his gma I’m going to have to deal with this regardless the hurt I’m going to have to try and heal. Im hoping and praying the heart ache never has to come because at the end of the day my loved ones are going to hurt and I never want to see that. When they hurt I hurt. What do I do ?