We've seen what it's like when Sheldon's mom and Leonard's mom are in the same room together.

But on The Big Bang Theory Season 9 Episode 24, we'll see what happens when you throw Leonard's dad into the mix!

While Penny tries to plan a wedding ceremony their friends and family can be a part of, Howard and Raj have their own concerns. Check out the photos below for a sneak peek!

1. Wedding Plans! - The Big Bang Theory Season 9 Episode 24

After talking with Leonard's mother, Penny has decided to try planning a wedding ceremony that their friends and family (and the audience) can be a part of.

2. Plenty to Talk About - The Big Bang Theory Season 9 Episode 24

Of course, Sheldon is also bound to have some opinions about all of this. But how much will all the chaos affect whether or not Penny and Leonard actually get their ceremony do-over?

3. Who's Going to Be Maid of Honor? - The Big Bang Theory Season 9 Episode 24

If Penny and Leonard actually do have their wedding ceremony, there is absolutely no doubt that Amy will be vying for the role of maid of honor.

4. A Family Affair - The Big Bang Theory Season 9 Episode 24

In nine seasons of The Big Bang Theory, we've never met Leonard's father. Until now! Chaos ensues when he shows up, along with both Leonard's other and Sheldon's.