I live in Michigan and have sole physical custody of my almost two year old son. His father left well over a year ago for vacation to California and never came back. He is now telling me I have to let my son be around his family who are completely unfit, and that when he comes back he will be taking my son.
Is there a current court order establishing Dad's right to visitation/parenting time?
If the answer is NO, you are not obligated to make the child available to Dad or to his family. Let Dad petition the court to establish his right to parenting time.
If the answer is YES, you need to comply with the existing order or risk being found in contempt. If you hope to have the Court modify the existing order before Dad returns, you need to petition now.
I have also had threats from his current girlfriend of her taking my son from me also, and not legally. My sons father is on drugs, drinks alot, and has in the past been in and out of the hospital for being mentally unstable. He has two sisters one has a convicted felon of man slaughter living with her( who is off parole now), the other has child neglect on her record. His mother (my sons grandmother) also has child neglect on her record.
What is your proof of these allegations? IF you have proof of the allegations, what is your proof that your child's welfare is endangered?
I dont want to take my son away from his father I want him to have supervised visitation.
Expect that even IF a court orders supervised visits, a graduated plan will be ordered. If Dad complies with the plan, he WILL earn the right to unsupervised parenting -- and you WILL NOT have the authority to dictate where or with whom he chooses to spend that time. Get used to that concept now.
No one can say for certain.
Given the child's age*, if you can prove that Dad has not exercised any parenting time for a year, you may have a better than even shot that supervised visits would be ordered.
... and how do I prove these things?
If you have to ask how, chances are that you cannot prove them. Which means that you'd be better off investing your energy into facilitating your son's reintroduction to his father.
*ETA