WE have always had pets in the family even before the children arrived,they have been brought up to respect and care for animals and have been present when puppies or kittens have been born to any of our pets,I think it depends how often your friends children visit her and if she would find having a pet to look after a bind if she maybe wanted to go on holiday etc as they can be a problem then,has she thought of maybe taking them to a dogs home or cattery where they could help with the care of an animal but not be committed in such a big way, it may be a better idea until they where older and their mum was more forthcoming to them owning their own pet.