Here's a comment from Larry Mullen Jr.:
"I was very fond of Bob. He had a dry sense of humour and he liked to laugh. When the opportunities arose, I would sit with him and chat and have a drink. He was a very Dublin man, a tough nut, a real working class Irishman. He loved drama and the opera. In the last five years of his life he became quite dandy. He started to wear cravats with his shirts. He was very dapper, with a real sense of pride in himself. Having heard all the stories of life in the Hewson household, when you saw the two of them together it was kind of funny. He always saw Bono as his kid. He didn't see the rock star. It was like, 'He's my son, he deserves a clip around the ear.' That's the way he behaved around Bono. And although he may not have said it to Bono, he took real pride in what the band were doing. But he also really enjoyed sticking the boot in, just because he could, with a snigger. I enjoyed that about him and I miss his humour."
That tells you as much about Mullen as it does about the Hewsons.