Can you explain to us the soul linking to identical twins, triplets, etc.? Are identical siblings an extension of the same soul or can they be different souls sharing identical DNA?

There is a mix of possibilities here. There is always an agreement by the parents and the souls involved for each new life to come down into the physical, but sometimes there are soul purposes to mix and match things in a way that might be unexpected. Usually, there is a group of souls or a pair of souls wishing to have close association and may come in as identical twins. So, each of the twins is served by those close associates, and being present as a soul extension. This is always to complete a karmic contract of some kind to make restitution or rebalance what may have been discord in the past, or may have been an unfulfilled partnership that is now being rewarded in the most direct and complete way physically possible, where the two come into life together on equal footing in a level playing field, so to speak, having equal standing in a family unit with an equal complement of physical characteristics and genetic complement to support them. One cannot set up a more identical starting point for life than arriving in the same family, in identical bodies. There is no soul purpose for having a clone of oneself within a family unit. But this, as well, does happen and will be done to protect the circumstances of the birth in some instances. So, if there is a division of the egg to form duplicate embryos, the soul being planned to come to those parents may well elect to come in as siblings, and this will be done. It is more common for a single soul to divide itself among the available embryos than for differing souls to come down in such a close relationship. The ratio is approximately 60:40, respectively.