AN ACT INCREASING THE ADDITIONAL EXEMPTION FOR TAXPAYERS WITH DEPENDENTS INCAPABLE OF SELF-SUPPORT BECAUSE OF MENTAL OR PHYSICAL DEFECT OR WITH DISABILITIES AND BOTH SPOUSES TO CLAIM THE SAME, AMENDING FOR THE PURPOSE SECTION 35(B) OF REPUBLIC ACT NO. 8424, OTHERWISE KNOWN AS THE NATIONAL INTERNAL REVENUE CODE OF THE PHILIPPINES, AND FOR OTHER PURPOSES