My dad passed away and now my siblings want to sign his house iver to me.What do I do next?

I'm sorry to hear about your father's passing.  If you are willing to take the property, I would encourage you to engage in some due diligence to understand whether there are liens on the property, any problems with the title, etc.  Once you accept the deed, any problems become your problems.  You should retain an attorney to conduct a title search and examination and share those details with you.  Passing the property to you may also involve payment of inheritance tax or even realty transfer tax.  An attorney can give you an estimate of the costs you might expect for the transfer.  My firm does real estate and estate administration work all over Pennsylvania.  Feel free to contact me.