Long lost Father In Law

I just had a baby less than 2 months ago. My husband's family is all over the world in many countries. He never knew much about his father since his father ( as far as he knows) left their country to find work when my husband was 7 and never came back. He met other women and had other children. My husband never saw nor heard of his father since that time.

So fast forward to today and I've been sending a pic a week of my baby to hubby's mom. She lives in Canada.
She casually texts me today that his grandfather ( hubby's supposedly long lost dad) loves him and she has given him my number to call.
Wtf?
My husband is pissed. He has known nothing about them talking for his whole life and she didn't text or call my husband to ask this.
I didn't want to get into any drama so I just said OK.
Also I'd like to know what the man looks like since my husband only barely remembers his dad's name and doesn't remember anything else.