Deducting pet expenses is usually something that you cannot do. However, there are a few animal related expenses you may be able to claim (consult an accountant or tax lawyer before you tax any position related to your taxes and deductibility):
Moving Expenses: If you’ve moved recently for a job, you can claim the cost of moving your pet.
Donations to Pet Charities: The same rules apply to charitable donations whether or not they are animal related, so you can deduct donations to non-...
Where is Dad located? My suggestion (not knowing all of the facts) is to consider bringing a guardianship proceeding to become the guardian of your father's person and property and invalidate the existing power of attorney because of your brother's breach of fiduciary duty. However, I would need to know more. You said half-brother. Are you both blood descendants of your father but with different mothers? Where was the house located?
Remember that when you gift assets, there is a carry-over basis. This means that if Mom and Dad gift you a house they bought for $10,000 that is worth $100,000 and then you go to sell it in a few years for $150,000, you owe capital gains tax on the full appreciation ($150,000-$10,000=$140,000).
There are tax breaks in the Internal Revenue Code. Section 121 excludes capital gains if the house being sold is your primary residence (you have lived there 2 of the last 5 years) up to $250,000...
If you are tenants in common as to the property, you can legally have the property either partitioned or sold. I would consult an attorney immediately. Some questions to raise are whether the property is or should have been income producing and if any of the tenants in common are in possession of the premises.
If you disclaim the inheritance, the assets pass as if you had pre-deceased the decedent. This may mean that the amounts pass to your spouse and not your children. It may also mean that the bequest will lapse in its entirety. I would take a copy of the will to a local estate planning attorney so that you are sure that your actions will achieve the desired result.