Staying outside of BE

Hello all,


I'm living in Belgium with a work visa ( type D) and my husband came to Belgium also with family reunion, he is not working. He is outside of Belgium for family issues, his total stay of time out of Belgium is now almost 3 months in a year. And he might need to stay 1-2 months more. But not aim to exceed 6 months.



Does my husband also allowed to stay outside for more than 3 months up to 6 months? I talked with the commune in Brussels and they said normally it is 3 months max in a year, nothing to extend it (any medical proof etc), and then resident permit can be cancelled if police finds out. Do you know if airport police control checks the passport and count days or they have anything in system? I also read some comments in the forum that some returned back after 4 months and nothing happened with their resident permit.



Thank you so much for the help in advance