Landlord vs Tenant verbal agreement
Son renting (shared) apartment, building burns down/lady dies in fire, Landlord (LL) offers another apartment to son, son explains can't afford higher apartment offered, LL states "no problem only concern is for tenants". LL and son enter verbal agreement where son does work in lieu of rent (no witness to this verbal). LL tells son to call secretary for jobs, son completes 2 jobs, (one with the help of my younger son). LL acknowledges and credits son for money paid on burnt rental (no problem), acknowledges and credits son for work completed but ignores 2 invoices submitted by son for work completed. Son moves out, 7months later LL suing for rent not paid.
Son has copies of the 2 invoices submitted for work completed, no credits given, son had younger bother help with one job completed (witness to work done), No other witness to verbal agreement but son and LL, son has copy of credits given to him by LL.
Does my son have a good leg to stand on in court? The way I see my son followed through in good faith on verbal agreement, LL acknowledged agreement with credit for some work completed (but not all). Son charged fair market value for jobs completed.
Advise? This is in state of Virginia. Thank you.