If your mother is not incapacitated, she could execute a "ladybird" deed under which she deeds the property to your sister while retaining a life estate and the ability to change the deed at anytime prior to her death. To protect against her becoming incapacitated and unable to make necessary changes in the title she should could execute a durable power of attorney appointing someone else (perhaps another sibling) as attorney-in-fact. Both documents should be prepared by an attorney after...
The important first step is to confirm that your grandmother was the sole owner of the property prior to her death. If this was the case, your brother, as personal representative, is the only one who can legally convey the property, and then only in compliance with Michigan statutes. If someone else has attempted to do so, the deed is ineffective, but still likely to confuse. Your brother needs to obtain the help of a real estate/probate attorney to sort this out. The taxes need to be paid....
If the funds are not in a trust, the only issue is whether your mother is competent. If she is, she can't be stopped from making bad decisions, although repeatedly making bad decisions could be cited as evidence of incompetence. You should discuss the matter in detail with a Michigan attorney familiar with elder law, but the fact that neither you nor your sister live nearby is going to make it extremely difficult for you to successfully intervene in this situation.
The corporation can issue shares to you in exchange for your membership interest in the LLC or the corporation can issue shares to the LLC in exchange for its net assets. Either way the transaction needs to be properly documented. I urge you to consult a business attorney.
Unless your father's friend in incompetent, your only alternative is to try to continue to work with her to preserve the property - perhaps by buying it from her if she needs money. If she is competent, she has the right to change her will and leave everything she received from your father to someone other than your brother and yourself. Discuss the matter with an estate planning attorney in your area.
The requirements for obtaining title to property by adverse possession do not include advertising. You must actually occupy the disputed property in a way that is visible, open, notorious, exclusive, continuous, and uninterrupted as well as hostile to the tile of the true owner continuously for a period of 15 years. If you wish to pursue such a claim, you should consult with a real estate attorney.
The answer depends entirely on how the property was titled when your mother and aunt bought it. If they were "joint tenants", the property passed to your aunt on your mother's death. If they were "tenants in common" or if the deed just listed their names without describing the nature if their ownership, 1/2 of the home passed to your mother's estate. A real estate attorney can look this up for you.
No. The beauty of a ladybird deed is that the current owner retains the ability to control and use the property during their life time, and this right cannot be interfered with by the children or their creditors. There are also uncapping issues. You should contract a real estate attorney for advice on how to attempt to reverse the deed to the four of you.
The general rule in Michigan is that agreements for the sale of land must be in writing. Like all good rules there are exceptions. If there is nothing in writing with your sister and if you had good title to the home prior to the transaction, title is still in your name. You will need to start an eviction action to regain possession of the property. Please do not do attempt to do this without the assistance of a real estate attorney.