The OP's father has severed ties with the OP's half-sister and her spouse. When the OP extended an invitation to them for their wedding, the father warned that he might not attend if the half-sister also came.
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OP's father is turning the wedding into a platform for his resentments, using financial and emotional threats against OP.
OP's father has escalated to the point of issuing threats to dispose of OP's belongings from the house.
OP should consider uninviting his father
If he chooses not to come, that's on him, not OP or his sister.
OP's dad seems manipulative and chaotic
OP's wedding, OP's guest list.
If he decides not to come, it's his decision, not OP
OP should visit his grandmother and mother separately, express his love, and explain the importance of his wedding
OP needs to cut off financial ties with someone causing drama and stress
OP needs to consider distancing himself from him due to his behavior.
OP should cut ties with the controlling person
OP finds himself in an awkward and emotionally charged situation. However, it's essential to remember that OP extended invitations to both his father and sister to celebrate his wedding.
The decision of whether to attend or not ultimately lies with them. OP should stand firm in maintaining these invitations.
It's not within his father's purview to dictate who should or shouldn't be present at his wedding. If his father chooses not to attend, that is entirely his decision, and OP has every right to be disappointed and upset by it.
Still, he should not allow his father's choices to determine the guest list for this significant milestone. This is OP's special day, and he should surround himself with those he cares about and who want to share in his joy.