Assess the validity of Anna's separate dispositions in his will:

1. My house to my sister Gemma upon the understanding that she will allow my son to live in the house until he completes his studies and finds a suitable job.
2. My shares in Cowies Ltd to Paloma on trust to sell and distribute, as she sees fit, to any members of my family that is an avid fan of the actor, Robin Williams.
3. 3000 to look after my private sanctuary of cats.
4. Two classic cars from my collection of three to my trustees to be divided amongst my best friends, Alex and Julia, with Julia having first choice.

Whatever is left to my mom so she may buy small souvenirs and distribute those among my good friends