I have read that part of the assessment will probably involve contacting former partners too. My previous partner, unless we go back 20 years, has died although I am still in touch with his family. DH has a son from a previous relationship (he's been as involved as much as he could, ex girlfriend was very volatile but has thawed out a big now - son is 21) and he also is divorced from a woman he married after her (not just after!) which was acrimonious as she ran off with someone else.
I imagine it would be questions about how I/DH deal with stress or questions along those lines but i would love to hear from someone who's been through it so knows from experience.