Siblings have it rough. They are competing for their family's affection. Still, it's worth it to build a stronger relationship. When things go really bad, often it's your siblings that you turn to as your only way out.
If your relationships have been rough until now, start very small. Maybe just connect on facebook or another network. Just let them into your world a little. If they won't do that, find a third party to send a message through. Make that first step.