I am a PhD student in Germany, and I'm going back in July.

My husband and i are non-EU residents but allowed to travel without visa for up to 90 days in 180 days in most schengen countries.

So my husband came to visit from 19 October - 22 Nov 2010, so that's around 35 days, so basically he has 55 days until 19th April (when the 180 days would be up).

So my question is, if he comes again in Feb, say, around the 26th and leaves before April 19th.
Would he be able to come back, like a week after that and stay for another 3 months until July (as it seems to me that his 180 days would restart on April 20th) so that we can go back to our home country together?

Thanks in advance.