Pairs and groups of asteroids with nearest orbits in known families

The problem of origin and age of asteroid families is studied very intensively. First of all youngest families are interesting due to possibility of the reconstruction their collisional history. But in oldest families present objects with very close orbits some of them are products of recent collisions. The search for and studying of dynamics of such pairs of orbits is a main aim of the present paper. In result, two new young groups of minor planets are detected as well as some new members of known families.