If the money is held jointly, it automatically passes to the other one on survivorship, and doesn't form part of the estate.
Correct. This is in all likelihood what has happened with both the bank account and home.
There are 2 hurdles here if your husband wants to challenge it.
1. That his parents really held the money as tenants in common rather than jointly. Unless that can be proved, there is no estate to distribute.
In the case of joint property/ deposists held by a husband and wife there is a very strong, indeed almost irrebuttable presumption that survivorship applies. One would need some very credible evidence that it was not intended by the testator that the ownership of the property/ deposit was to pass in this manner.
2 That the father failed in his moral duty by failing to provide for his son (Application under S.117 of the Succession Act, 1965)
A section 117 claim can only be brought against the value of the Deceased's
Estate. i.e. property that the Deceased's estate was beneficially entitled to on his death. As the joint property/ deposit does not form part of the Estate, meaning the Estate is essentially worthless or at best of very limited value, a section 117 claim is utterly pointless.
In any event, section 117 action cannot be brought where the entire of the Estate of a Deceased is left to a surviving spouse who is also the parent of the plaintiff-child. So even if the Deceased had left 100% of his Estate to his spouse the children would have no come back.
It's a VERY high bar to cross, and I wouldn't rate your chances. If it had been someone else, you'd have a better chance, but it's very unlikely to succeed against your husband mother.
I can understand you're dissappointed, but at the end of the day, people are free to dspose of their property as they see fit
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