Ginger cat and kittens Frobisher/Lausanne Road N8

This lovely ginger cat has been spending a lot time in our garden for the past 4 months. Does anyone recognise him or know where he lives? We’d love to ascertain if he is owned or stray. He seems to be the loving father of a ginger kitten (pictured) and possibly a black and white kitten. We have seen other kittens and we are wondering where they live. They look healthy but would be good to know if they are being cared for. We don’t want to interfere if he has a loving home, just likes hanging in our garden!  
any info appreciated. East end of Frobisher Road backing onto Lausanne Road.