Bhaubali mother was fooled by his other son that bhaubali wants to kill his brother for crown..so then his mother tells kattapa to kill him....after they kill him then they are aware about the lie
Bahubali was in love with Devsena and Bhallaldev also loves her.Sivagami Devi ordered who ever will marry Devsena has to left Kingdom.Bahuballi agreed and married Devsena and left Mahismathi. Bhallaldev become king of Mahishmeti and ordered kattapa to kill Bahubali As a loyal servent he had to follow king's order so he killed Bahubali
Bahubali didn't give him party on the following occasions. 1. For the training he gave to him 2. When he became the king of Mahishmati 3. When he got his girl friend 4. When he got married 5. When he became father Frustrated of begging for parties every time, he only got kicked heavily. When he didn't get the party even when Bahubali became a father, he ended his frustration by killing him.