How to distribute the elders between the two brothers?

The two brothers share and deduct 2000 yuan to support the elderly every month, and the monthly share of each person does not exceed 1000 yuan. Can be divided equally, can also be agreed by the supporter, can also be designated by the dependents. If the distribution is agreed or specified, a written distribution agreement must be signed, and the specified distribution takes precedence over the agreed distribution. The specific allocation method and amount cannot be changed within a tax year. Article 22 of the Interim Measures for Special Additional Deduction of Personal Income Tax stipulates that the maintenance expenses of a taxpayer supporting one or more dependents shall be uniformly deducted according to the following standards: (1) If the taxpayer is an only child, it shall be deducted according to the standard quota of 2,000 yuan per month; (2) If the taxpayer is a non-only child, he and his brothers and sisters will share the deduction of 2,000 yuan per month, and the monthly share of each person cannot exceed 1 1,000 yuan. Can be divided equally, can also be agreed by the supporter, can also be designated by the dependents. If the distribution is agreed or specified, a written distribution agreement must be signed, and the specified distribution takes precedence over the agreed distribution. The specific allocation method and amount cannot be changed within a tax year.