Truth is @bigdude...the 'whole' family is very complex; but, staying in touch is so important on so many levels. Even in these connected times, oftentimes family members become estranged for one reason or other. The thing is, always try to be there for your sis; because, you are her closest go to (humanly speaking) (whether you know it or not ;+)...when life htf.

Prayers that you will find someone to fill her place in your life.

Best regards.

Peace.