1) No that’s not true. Allah will unite the believers in Jannah and they would recognize each other. Spouses will be given the option to be together in Jannah.
See Surah Ghafir verse 8
2) Muslims who died with complete faith yes, eventually they will go to Jannah. But Muslims who died with incomplete faith may not go to Jannah. There are Muslims who lead evil lives and at the moment of death they lose their faith and die without complete faith. Such Muslims may not go to Jannah.
We also have hadiths that any Muslim who has hatred for the Ahlulbayt (a) in his heart will not be entitled to Jannah