NBA 2K14 looks really good, Forza is a great choice, Tomb Raider looks really nice as well and Ryse is pretty but I heard boring to play. Any of those would be good choices to show off.

Ryse is probably the prettiest game i have ever seen. And extremely fun to play through.

To show off its graphics or its gameplay?

For graphics, Ryse.

Gameplay... well, honestly I'd give the best gameplay on the console so far to Assassin's Creed 4, which is an excellent game and all, but plays the same as on last gen. Maybe Titanfall?

Exactly what i was thinking lol

Show her Ryse if you want to show off 'dem graphics' or Titanfall if you want to wow her lol.

I would go hands down with Ryse and NBA2k14... try Ryse then you'll decide if the game appeals to you or not. Killer Instinct and PVZ are nice showcase also, vibrant colors and lots of particles.

Your Mother-in-law plays video games? & bought you a Xbox One? Goodness

Also, do what this guy says and she will probably get ONE

After you show the game off of course. Then get cocky and use the Snap feature and show it off lol. Let her know she can also Skype her fam from it also :)

Interestingly, the best game to show off is not an exclusive. I'd go with Tomb Raider.

Yeah that's a pretty awesome mother in law!