Falling in love with brother in law after husbands death. what are your views?

This question is not for me, but for a friend/coworker of mine. Her husband Jeff, his brother Eric and Erics 8 year old son Connor, were in a horrible car crash nearly a year ago. Her husband Jeff and his nephew Connor died. Eric (who is unmarried by the way) was severely injured and spent about 2 months in the hospital and went through months of physical therapy. Both my friend, Tracy, and Eric have also gotten counceling. Needless to say, both Tracy and Eric were devistated. Tracy lost a husband and Eric lost a brother and son.Suddenly, Tracy and Eric were thrown together in their dispair and grief. Each leaning on the other. Each trying to be there for the other one. Well, in the months that followed the accident, Eric and Tracy got very close and are now in love. Have been an actual couple for about two months now. The problem is, that many family members on both sides and some friends of the dead husband, Jeff, are not happy with this and think that it is disrespectful to Jeff. Jeff and Tracy were happily married before he ped and like I said, Eric is unmarried. To me, I understand how two people can come together in grief and fall in love. I also think that Tracys husband would have wanted her to be happy again, and be with a good man. It will be a year in October since the accident. What are your views on this? How would you feel if you were a friend or family member of Jeff?