The swan and cygnets

Our local lake has had a pair of swans breeding on it for quite a few years now the pen has been sitting on six eggs four of which hatched a few days ago. There is no sign of the cob. Two of the cygnets are staying close to mum and two are more adventurous, she is keeping a watchful eye to ensure they do not stray to far, Reynard is in the area. She still has two eggs to hatch we wish them all well.