The on-loan Arsenal attacker celebrated his first Cardiff goal just a day after hearing the news that his grandfather had suffered a stroke.
Emmanuel-Thomas' goal added to Michael Chopra's strike at the KC Stadium that maintained Cardiff's promotion push.
"He has had a really rough last couple of days," revealed Cardiff boss Jones. "His grandfather had a stroke so he was really down on Friday and got in late.
"He travelled here with us so that goal would have picked him up a little but.
"And now he is off to see how his granddad is. So full credit to Jay.
"It is nice for him. It's his first goal and his performance the other day was really good and he capped it here with a goal."