There is not enough information in your summary to really answer your question. Statutes of limitations are tricky beasts, because you *may* have an argument that the statute does not begin until you learn (or should have learned) that you had a potential claim.
There are some general statutes of limitations that are six years. There is no statute that I am aware of regarding undue influence, but there are statutes related to time periods to contest a trust. Depending on the nature of the claim and the administration of the trust, your statute of limitations could be as little as 4 months. It could be a year. If the assets were all distributed several years ago, however, whether you technically could bring an action may make little difference, if the trustee is going to be uncollectible.
Your case is going to turn not only on the applicable statute, if there is one, but also on the nature of your claim and the evidence that you have. The burden of proof is against you, even if you are within the statutory period for filing a claim. Your best bet is to take your evidence and meet with a qualified probate litigator in your area. He or she can tell you what your options are and what the likelihood of success is. Your question should not necessarily be, 1) Can I bring a claim? The question should be, 2) Can I win a claim?
I am licensed to practice law in the State of Michigan and have offices in Wayne and Ingham Counties. My practice is focused in the areas of estate planning and probate administration. I am ethically required to state that the above answer does not create an attorney/client relationship. These responses should be considered general legal education and are intended to provide general information about the question asked. Frequently, the question does not include important facts that, if known, could significantly change the answer. Information provided on this site should not be used as a substitute for competent legal advice from a licensed attorney that practices in the subject area in your state. The law changes frequently and varies from state to state.