Will family members get to visit each other if separated into different kingdoms in heaven? I have been told by my LDS bishop not to fear losing family members forever. I know that the family is very important to Heavenly Father and his Son, but how important is it really?

Will we get to visit our families in heaven if we are separated into different kingdoms,  such as the Celestial, Terrestrial, and Telestial kingdoms? Will only people from the Celestial get to visit others, or could family members in the Telestial visit someone in the Celestial? 

I have always had the fear of losing family because we won't be able to visit each other in heaven. I have also had the fear that I might be the person to be in one of the lower kingdoms.

I would like an answer based on LDS traditions and beliefs.

I would also like to consider this question as to how could I answer it based on LDS beliefs if someone else asked me about it.
The main verses of scripture that apply to this are D&amp;C 76:86–88, which is in the section of D&amp;C 76 that discusses those in the telestial kingdom:

86 These [those in the telestial kingdom] are they who receive not of his fulness in the eternal world, but of the Holy Spirit through the ministration of the terrestrial;
87 And the terrestrial through the ministration of the celestial.
88 And also the telestial receive it of the administering of angels who are appointed to minister for them, or who are appointed to be ministering spirits for them; for they shall be heirs of salvation.

In other words, there will be ministration by those in the celestial kingdom to those in the terrestrial kingdom, and also by those in the terrestrial kingdom to those in the telestial kingdom. You can go down to visit people, but not up.