He was hoping son would look like him.
He is Hawaiian.
This is not a common heritage/culture.
But... remind your Husband, that Hawaiian people are very very gracious... and often, take in "Hanai" children.
Your and his son, are yours.
But, your baby son, resembles his multi-ethnic heritage.
My kids are Hapa. Tell your Husband.
So, my kids have darker hair... but on my daughter's legs for example, there are some blond and even red, hairs.
On my son's head, there are also some Red or Blond hairs.
Although, both me and my Husband have dark hair.
But my Husband's side, is more "Haole" and has more variance in that sense.
Your Husband, cannot get over the "appearance" of your baby.
BUT, many times, the hair color changes as the child gets older.
My Husband was born Blonde. But as he got older, he is Brunette with dark brown hair.
TELL your Husband... he is Hawaiian. Be Proud. Because... this is a culture, that is known for its grace and graciousness... and its "Aloha" spirit and loving.... for all kinds of people.
So many kids, are born "Hapa" and that is the beauty of it. Because, Hawaii is made up of the colors of a rainbow. Not all one color.
Your and his baby... resembles the "rainbow" of your entire family.
But being a Hawaiian Man... he probably just really wished, that his Hawaiian background, was more obvious in his baby.
That's okay.
Because, Hawaiian people... are, very special and not found all over the world.
They are the indigenous people, of Hawaii. Only, of Hawaii.
Tell your Husband, appearance is not important.
But he already knows that.
And, there are also many light skinned/haired Hawaiians, even with light eyes.
ie: the Cazimero's of the Hawaiian music industry here in Hawaii.
Your Husband, should know that.
But since your Husband has his 1st son, and being Hawaiian... I am sure he had hope son would reflect his Hawaiian heritage.
Don't worry.
Your Husband can teach him and nurture him in the Hawaiian way.
***Your Family, needs to stop making comments about the baby and how he looks like your brothers, instead.
How insulting.
Not respectful to your Husband.
And, I imagine, your Husband must live with that EVERYday. Being he is in your part of the world and near your family... not his.
Really, as you said, your Husband's reaction, did not start until Your Family, started making comments about the baby and how the baby looks like them, not your Husband.
Really, hurtful to your Husband.
You really... need to tell your family, to stop it.
Does your Husband... have ANY family/relatives nearby?
They should come to visit.