Other cats in the garden

Well our place is turning into quite the little cat centre.  Upstairs have added a cat flap to their balcony which overlooks our garden and 7 month old black and white Adelaide and Honey are now frequenting the garden.

Another regular is Marmite from next door and he is an enormous black cat.  

At the week-ends if it is nice cat mother has a habit of opening the doors and windows when she is in and I've noticed that all three new additions have started to come in to our home and explore and cat mother does nothing!  All I can say is that she has no right to complain if we go into other people's houses if she let's strangers into our home!