Tens don't marry ones. It is not your fault. It is not your life. Keep your distance from all clients. For some that simply means lunch meetings are fine, but no socializing with family members.
Some corporate practices require the attorney and client to be particularly close.
Well-established boundaries mean that your phone number can be in the book and the clients do not abuse the privilege of calling. The irony for the lay person is that we can engage in vigorous litigation with a dear friend on the other side and have dinner together the next weekend. We have to be able to separate our selves from our roles. Establishing and maintaining appropriate boundaries is the responsibility of the professional, not the client. Clients may also need to work on their boundaries, but the professional is in charge of this particular relationship.