Whats the best way of dealing with an overly critical mother in law who makes snide comments about your height and ethnicity?

I'm thinking of inviting my sister over for Christmas for some back up because I know she'd throttle that whore if she starts.

Like enough with the alcoholic, potato and leprechaun jokes. I know she wanted her son to marry the 6ft tall prom queen miss America contestant ex model with a masters degree that he dated a few years ago but he married me and I'm not going anywhere.

Whats the best way of dealing with an overly critical mother in law who makes snide comments about your height and ethnicity?
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