The bridegroom's behavior is clearly inappropriate and harmful. The bridegroom's actions are causing genuine distress and discomfort to the younger sister. The family's dismissal of her feelings is exacerbating the situation, leaving her isolated and unsupported. The sister should not be forced to endure such discomfort at what is supposed to be a joyous occasion.
While the groom's behavior is questionable, the complainant seems to be exaggerating the situation. The so-called 'harmless jokes' are subjective and may not warrant such a drastic reaction as boycotting her sister's wedding. The sister's discomfort should not overshadow the significance of her sister's big day. The complainant is being overly sensitive and potentially creating unnecessary drama within the family.
The groom's behavior, as described, constitutes inappropriate and unwelcome conduct, especially given the age difference and power dynamic. The family's dismissal of these concerns is deeply troubling and fails to protect the younger sister's well-being. While family harmony is important, it should not come at the cost of personal safety and emotional comfort. The sister is justified in feeling uncomfortable and should not be pressured to attend the wedding if she fears for her safety or well-being.