Thought I could add plenty to the stuff ruined by parents/in-laws thread, thought I'd start some new thread and give props where it is due.

Both my MIL and FIL are pretty good cooks. Things they do great that I didn't have a lot of exposure to prior to marriage:

Bacon Marmalade for Grilled Cheese Sandwiches
Homemade biscuits
Grilling on a Hasty Bake grill (we almost exclusively sous vide/cast iron, so the occasional grilled cut of meat is awesome)
Pt

My mom:
Corn Dip (mayo, jalapenos, cheese, chilies, etc.)

My mother makes THE BEST Argentinian beef empanadas. Like they make them in Buenos Aires - with hard-boiled eggs, olives, and raisins. She also makes an awesome "guiso" (or Italian beef stew). OMG, I love that stuff. She also makes a really good Serenata, which is Codfish Salad with Root Vegetables. It sounds weird, but it's great. She also makes good alfajores, but they are a HUGE project and we've only done them a couple of times.

I loved my mother-in-law's spaghetti sauce. She passed away so I'll never have it again. She did not have a recipe. She started with a big jar of sauce but then made it her own by adding all sorts of delicious goodness to it. She also made really good fried chicken. I didn't know how to cook when I got married. I wanted to make foods my husband liked so I pestered my MIL incessantly to learn to cook the foods my husband loves.

My Aubelo (mom's father) made the world's best flan. My sister took up the banner when he died and now she does it. Doesn't exactly fall into the parent's category but it deserved a mention.

nothing from my in laws stand out. my wife and brother in laws would disagree with me to the end of time. They think both are excellent cooks. While the food isn't terrible, most to me is a lot of grease and a lot of butter. I normally feel like **** after every meal they make.

My side of the family is generally the better cooks (2 of my brothers are chefs). That being said, my wife is French and I've had some amazing culinary experiences traveling there to visit.

MIL makes great Korean Bbq, but I can get that lots of places. Her fresh cucumber and apple kimchi is AWESOME though.

My MIL comes over and occupies my kids so I can cook up something. Best I got. Their favorite restaurant is Luby's, so flavor isn't their forte. FIL used to show up 5 minutes before the food was served. I made some comments about feeding stray dogs and now he shows up a little earlier.

I complained about my in-laws scratching our cookware in the other thread, but on the flip side they make some outstanding traditional Cantonese dishes (from HK, still live there) when they come into town.