I think that kittens have to be at least 6 weeks old and before 6 months as they become 'socially' active around then.Check that with the vet though. I don't think they will do the mum whilst she is nursing. But again check that out as it might be different here.
Xena I believe they do clip the ear automatically but again as with all things in Doha, check it out.

I found the Doha Vets (listed in Maharba) very helpful re strays. They will MOT them and neuter them for a discounted price also. They will also lend you a cat box in advance to bring said cat to vet if you need one.

Good luck.
I love cats but I can never eat a whole one in one sitting.

Desert Witch