Yes, this is normal. I had one foster kitten suckle her mom until she was almost 6 months even though momma had no milk since the kittens were 3 months. If it was bothering your boy, he would stop the kitten, I would allow it to continue unless it starts to become bothersome to your older kitty or a health issue.
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Cat maid to:
Rose semi feral, a cpietra rescue, female tabby (approx 13 yrs)
Jasper RIP (2001-2018)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey
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