Since the house is in your Husband's name, it is better you do not push them, further, take your husband on your side and through him instruct them to vacate the house.
Further, your husband can not throw his parents out from your house, it is his duty to look after them.
However, he can arrange an alternate accommodation and put them there.
With regard to your BIL and his family, they can be thrown out, else, you can with the approval of your husband, initiate Domestic Violence case against BIL & his family & also lodge complaint with police against them.
Do not yield to emotional or other types of blackmail.
If above option of pushing your husband does not work, taking your husband in to loop, you can lodge DV complaint against all of them (be careful with this option)