It is hard with small numbers (both sheep and cattle

) but we mix and match depending on what's going on and since they all actually know each other anyway, they're usually fine.
Otherwise you end up with loads of tiny groups taking up paddocks.
We've got our 6 twin bearing ewes in the barn; the three single bearing ewes and the three ewe lambs in the paddock with field shelter and the barren ewe with the tup and wether. The three singles will be coming into the barn on Friday and the barren ewe will go in with the ewe lambs. As they lamb, the ewes and lambs will join the ewe lambs and Nellie. I don't think Ryelands are high stress sheep tbh