Mother-child teacup

The mother-son teacup comprises a mother cup and a son cup, the mother cup comprises a cup body and a cup cover, the upper end of the cup body is in a curved surface convergent shape and is provided with a convergent opening, the outer portion of the cup cover is cylindrical, the bottom of the cup cover is in a curved surface shape, and the cup cover is nested with the upper end of the cup body and is in threaded connection with the upper end of the cup body; a secondary cup groove is formed in the lower portion of the primary cup, strip-shaped clamping grooves are formed in the two sides of a groove opening of the secondary cup groove respectively, the two strip-shaped clamping grooves are provided with arc-shaped plates, the arc-shaped plates are in vertical sliding fit with the strip-shaped clamping grooves and the cup body, and the secondary cup is arranged in the secondary cup groove and limited and blocked by the arc-shaped plates. The cup cover is hollow, and a flat cover is arranged at the upper end o