1. Written Statement ought to have been filed by now. Since the time period of 90 days is over the court cannot take it on record now except if there are exceptional reasons.
2. You cannot be proceeded ex parte as long as you are contesting the matter, but the defence will be struck off.
3. Plaintiff as a daughter in law has a right to reside in the shared household even if it is owned by her father inl law. Your father should have filed a suit for eviction of his daughter in law.
4. Under Section 10 CPC the court can stay the matter only if a similar issue is pending in another court between the same parties.
Unless the pleadings are perused no opinion can be formulated on the application under Section 10 CPC.