One-half support. The insured person provides one-half of your support if he or she makes regular contributions for your ordinary living costs; the amount of these contributions equals or exceeds one-half of your ordinary living costs; and any income (from sources other than the insured person) you have available for support purposes is one-half or less of your ordinary living costs. We will consider any income which is available to you for your support whether or not that income is actually used for your ordinary living costs. Ordinary living costs are the costs for your food, shelter, routine medical care, and similar necessities. A contribution may be in cash, goods, or services. The insured is not providing at least one-half of your support unless he or she has done so for a reasonable period of time. Ordinarily we consider a reasonable period to be the 12-month period immediately preceding the time when the one-half support requirement must be met under the rules in 404.362(c)(1) and 404.363 (for child's benefits), in 404.370(f) (for parent's benefits) and in 404.408a(c) (for benefits where the Government pension offset may be applied). A shorter period will be considered reasonable under the following circumstances:
(1) At some point within the 12-month period, the insured either begins or stops providing at least one-half of your support on a permanent basis and this is a change in the way you had been supported up to then. In these circumstances, the time from the change up to the end of the 12-month period will be considered a reasonable period, unless paragraph (b)(2) of this section applies. The change in your source of support must be permanent and not temporary. Changes caused by seasonal employment or customary visits to the insured's home are considered temporary.
(2) The insured provided one-half or more of your support for at least 3 months of the 12-month period, but was forced to stop or reduce contributions because of circumstances beyond his or her control, such as illness or unemployment, and no one else took over the responsibility for providing at least one-half of your support on a permanent basis. Any support you received from a public assistance program is not considered as a taking over of responsibility for your support by someone else. Under these circumstances, a reasonable period is that part of the 12-month period before the insured was forced to reduce or stop providing at least one-half of your support.