You need to contact a probate litigation lawyer right away about this.  Be sure that the lawyer does probate litigation beccause not every probate and estate lawyer will litigate.You may have a claim against your father for misusing your stock.  However, you cannot place a lien against his house without filing and winning a claim against him.  In Florida, you would not be able to place a lien against his house because Florida protects homesteads from creditors' claims.  I do not know if California has a similar provision.Please consult a probate litigation attorney to find out what you can do.