Partner is expected to pay majority of aunt's funeral costs but isn't allowed to attend the service

Last week my partner's aunt passed away unexpectedly from a stroke. She didn't have a will or any life insurance policies.

During the funeral planning her son was given the choice on whether she was cremated or buried. He chose burial. All other planning was left up to other family members.

During the planning it was agreed that everyone would contribute equally to the funeral costs.

This week is her funeral and my partner's family is putting pressure on him to put up the majority of the funds himself. His sister is only contributing $8. His cousin (aunt's son) isn't contributing anything. His father (aunt's brother) also isn't contributing anything.

And now they are also telling him he isn't allowed to attend the services. They're trying to use some BS excuse that he can't attend because he has a cold like we're still in the middle of a pandemic.

The person who is expected to pay the majority of the funeral costs should at least get to attend.

Note: I'm posting this with his permission.