Bowing is not permissible. After marriage, your parents in law are your mahram and you can kiss them.

On wedding ceromonies are we allowed to kiss our mothers fathers and brides mother father and other elders on there hands and kiss their forheads as to show respect is this ok to do Rather bowing down to somebody.

Dealings and Attitudes with In-Laws | December 15, 2016 4:10 pm
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sheikh,I wish I didn’t have to complain about my in laws. It’s unethical I know. How do I deal with my mum & sis in law… they keep calling my mother up, spreading outragous lies about me at the say so of my psychopath husband. All of my in laws are terrified of him especially his mother by her own admission. They made the relationship between me & my mum turbulent. Advice?
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Brother of my husband had posted some pics of my daughter on facebook when she was 6 months. when I asked him to remove he became stubben & said no matter what he will never remove and whenever he feels like posting he will and which he actually did also. my husband’s family backed him up. my husband stoped him at first but to avoid any kind of bad environment at home my husband kept quiet later times and asked me to be patient and let him do whatever he want.