Welcome to the Bogleheads Forum!
My questions are:
What tax consequences will I incur by cashing in this stock before year's end?
If received as a gift, you will ordinarily pay a capital-gain tax on any profit based on the original purchase price paid by your dad. If inherited, you will pay a tax on any profit since date of death.
And does anyone have recommendations for where to put the funds?
Money needed "to purchase a home any time in the next 2 years and readibly available" should not go into stocks. I would consider ANY low-cost, short-term, good quality, diversified bond fund.