My mother's getting married 1 week before my c-section should I go?

My mom met a guy in Dec. And told me by the first week in January they were getting married.literally like two weeks after they started dating. My mom was married to my dad who died of cancer for 30years+ 3 years of dating. He died almost4 years ago. Anyway, my mom only pushed for me and my husband and children to meet this guy once when she found out her brother was coming to town. We met everyone at dinner. I sat directly across from the man and he glared at everyone the entire hour long meal and had this pissed off "i don't care what anyone thinks" attitude the entire evening. By the way he didn't say one word to anyone either the entire meal.not a word! I didn't know it was possible to have dinner like that. Fast forward a few weeks. My mom keeps hinting around that they are getting married around spring break( my sister's and my birthday week) finally after a few calls I just come out and ask her if she got married, to which she says yes! A freaking week earlier!! 2 days before my sister's birthday and 4 days before mine. ( our birthdays had already pasted by then). Then she announced she wasn't telling anyone unless they guessed (like I did) and were going to have a "fake" ceremony about a week before my c section so his family will think that this is the real wedding because they don't approve of elopement. I just got out of the hospital about a week ago for dehydration from the flu and an infection ( was there four days). I am still trying to recover but I am turn about going. On one hand I love my mother and would like to go. I love marriage been married for almost ten years and think yeah! But on the other hand I can't believe she is acting so sneaky and lying to me and my family( about already being married) . Furthermore I don't understand why she would get married so close to our birthdays and then if that isn't crazy enough deciding to have a ceremony right before her first granddaughter s birth to a man I met once and who was so freakin rude!

Help! But please be kind I'm supposed to go to this lying ceremony in a few days and I seriously don't know what to do. Ps. My mom also told me they are up and moving out of state this summer( she was/is the only semi involved grandparents to our two toddlers+one on the way)

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