1) Yes you can pray Jama’a in your house with your spouse, and you would get a great reward for that. However, the guidelines of Jama’a must be observed, such as the one leading it being Adel (just/upright).
2) For example, here’s a hadith on the reward of praying Jama’a:
From Imam Sadeq (a): praying in Jama’a exceeds the reward of praying individually by 24 degrees (24 times).