There are many reasons why parents might treat children differently - estrangement, need, substance abuse, bad with money, mistrust of the in-law, loans made to children, one child helped the parent the most, etc.
I have to be very careful in cases like this, and keep detailed notes. I have to make sure the parents are not being influenced. I ask them to write a letter in their own words (to be stored with the will) explaining why they are treating the children differently.
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