Daggers Under the Sleeves

Gael had the entire perimeter in the club searched and the security tapes checked. The small packet that was the size of his hand was at the front desk. Many patrons came to the club, and it seemed as if it was placed there inconspicuously. They only noticed it was there a few minutes later.

After the security checked the CCTV, they saw a caucasian man in his 30s, slipping it on the desk before entering the club. They didn't find him inside anymore, and there was no record of him going out through the front, so he could've left through the back door where only exit was allowed.

Gael made some calls, and by midnight, he learned that Alessandro and Giovanni had received a package too. Thinking that it was a bomb since it came in a box, their men checked it first. Inside the boxes were their father's shoes—one pair, one shoe on each of the boxes. They knew it was the shoes that Severino wore last before he died.

What kind of sick person would do this?