I am always put down by my family members whenever a situation arises when there's a decision making time. Recently a cousin of mine had an affair with someone, there were many discussions which went on in the family, but no one could come to a decision. Even I though I tried helping by thinking reasonably and logically, I am put down by my members on the context that I am younger and should not interfere (despite the fact that my cousin is only 2 years older than me).
This was just an incident many times I am also cut down on the context of how I am talking(they think I am being rude,because of my tone), even though my family knows the tone in which I talk, they try to cut me down in similar situations pointing to my unacceptable way of talking. When I correct myself, by “trying” to be nice (even though I was,and was just helping them get to a conclusion), they tend to not pay heed on what I say next.
How can I get them to take my opinions more seriously?