Should one child get more in a will than another?

🥀M
We were discussing wills with our families. My inlaws have it set up that each child gets 20% (3 kids) and the 4th (youngest- has a disability) gets 40%. He will likely always need an aid at home but has potential to get a job. While my parents have it so that my husband and I will get 50 % our kids will get 30% and my bother 20% (bad terms with parents). Is it fair do you think? I always planned on doing 50:50 but I guess we'll see 😊

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