The relationship between Mark and Donnie

I was watching 2 episodes last night, and thinking the same thing.

They're together occasionally on the show. I distinctly recall the two of them playing basketball on one of the episodes.

They're not together much, though, but that could be explained by the fact that Mark is shooting and promoting movies all over the world most of the time, and Donnie is shooting a tv show in NY. It could also be explained by the fact that Wahlburgers is a show about the restaurant, and thus focuses primarily on Paul (and Alma) and the sibling's relationship with them, not each other.

That being said... you never know. They do talk about being highly competitive, so I wouldn't be at all surprised if Mark's monumental success didn't bug Donnie a bit.

I did notice that Mark wasn't at Donnie's wedding- which, again, is most likely a scheduling conflict, but, there also wasn't the obligatory 'wish I could be there' phone call from Mark (that he does when he misses an important event for Paul).

If I had to bet, based on their interactions with Paul, both get along with Paul better than each other, but I wouldn't necessarily bet on there actually being any bad blood between them.

That's a good question. The episode where they played basketball together probably was the only one I've ever seen of them together. They seemed to get along, BUT now that I think about it, they didn't really talk a lot to each other. They more played off each other's taunting to Paul. When Paul complains to Donnie about Mark, Donnie would laugh and say, "Well that's Mark for ya" basically or Donnie would say, "Better do it cuz Mark is the biggest investor, blah blah blah" but he wouldn't have anything positive to say about him. He always talks openly about his other brothers like Jim and Bob though which is quite odd. And it's funny cuz if it weren't for Donnie, Mark would be nothing. Donnie used all his connections through the NKOTB to get Mark signed and wrote and produced both of Mark's albums. You'd think Mark would be more grateful. I do believe they were extremely close when they were younger though, being the youngest two and seeing ALL the pix of them together on Wahlburgers and the interviews Donnie did with Mark to support the Funky Bunch's promotions. And Donnie did back up Mark a LOT when they were growing up. Whenever Mark would get into trouble, Donnie fought whoever was getting in his face. Still it's a mystery yeah, maybe the producers of Donnie Loves Jenny forgot to broadcast the "Sorry I couldn't make it phone call" I don't know. Maybe they didn't think about it. I do know that though Donnie is rich, Mark is at least 4-5 times richer now. It's sad but Donnie is the one who made it all happen. I used to think Donnie had a huge ego but I know he's probably my favorite one. He's got homes in NJ, Boston, and Chicago now. that's how he roll! hehe.