AgriLife Extension Service# College of Agriculture and Life Sciences# Texas Master Gardener Extension Hort People.
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hmmm would it be at all possible
For either you and your husband, or his sister and her husband, to take her in (if either family has a spare room)?
If she is simply lonely, perhaps having her loving family around her might give her the oomph to tell this guy to take a hike.
She might be listening to him and be in denial about her health - few people really LIKE the idea of being diagnosed with a chronic condition like diabetes.
Did he make those horrible comments about your son (her GRANDSON) in front of him? Is she aware of the things he says?
You might enlist the help of a mediator or family counselor or someone professional. Keep track (date, place) of the things he says and things that happen to her. This almost smacks of abuse...I'm no expert, but it checking into.