Green for correct, yellow for neutral, red for wrong
Three siblings - Alfred, Brenda and Charles - like one of the colours green, yellow and red (not necessarily in the same order). When asked about their favourite colours, they gave the following answers:
Alfred - "Charles likes yellow."
Brenda - "Alfred likes red."
Charles - "Brenda likes green."
In their family, it is known that the green lover always tells the truth, the yellow lover sometimes tells the truth and sometimes lies while the red lover always lies. What is Brenda's favourite colour?