My family photoshoots include individual portraits of each child. It is best to start with these if your children feel confident to do so. My photoshoots are completely child led so can be easily re-ordered to suit your children's needs.
I then move on to sibling photos. This can also be done with more flow posing at the same time as the individual portraits. ie. Child, together, other child. This works well with younger children when they don't have such a long attention span.
I usually then do some candids photographs with parents and this usually leads to getting some posed images at the same time. I can do desired combinations (such as mum with each child etc.).
It's a good chance for your children to relax and enjoy themselves. I usually also get some photographs of the whole family together.
I then tend to do the more formal posed family photographs. If I can do this by using small adjustments to where you already are, I generally prefer this option so that we don't disrupt the children. If the children either need a break or have really enjoyed the process, I will do the family photographs on a new setup.
I tend to do extended family portraits at the very start or very end of the shoot. This is the time that children are most likely to want to sit on their families laps.
Family photoshoot sessions can also be for those with grown up children; it's never too late to get portraits done!