I used to foster and sometimes had mother cats with kittens.
Most mama cats seem to naturally wean their kittens between 8 and 10 weeks. (Or the kittens decide to wean, who knows.)
But once in a while the kittens will nurse much longer (if mom is accommodating). If the mom is tiny, that picture is what happens... kittens almost as big as mom still nursing. 
Also interesting that in colonies or other situations where more than one mom with litters is living the same place at the same time, mommy cats will usually share nursing duties. Once I had 3 litters of kittens (with 3 mommy cats) at the same time, and it was a free-for-all when it came to nursing. The kittens would *usually* gravitate toward their own mothers, but they all got around.
Anyway that picture made me smile. I miss having mommy cats with kittens. Mommy cats rock.
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