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In this work, we study the lepton-number-violating processes of K ± and D ± mesons. Two quasidegenerate sterile neutrinos are assumed to induce such processes. Different from the case where only one sterile neutrino is involved, here, the C P phases of the mixing parameters could give a sizable contribution. This, in turn, would affect the absolute values of the mixing parameters determined by the experimental upper limits of the branching fractions. A general function which expresses the difference between the mixing parameters for two-generation and one-generation cases is presented. Special cases with specific relations of the parameters are discussed. Besides, we also thoroughly investigate the C P violation effect of such processes. It is shown that generally A C P is a function of the sterile neutrino mass. [ABSTRACT FROM AUTHOR]