"have close relations" is correct and acceptable in written English.
It's used to emphasize that two people or groups have a strong/intimate relationship or connection with one another. For example: My family and I have close relations with our neighbors.
They have close relations with political parties and the disputes over land-related transactions among the builders, estate agents, political patrons and government officials are settled through money, connections, police patronage, and even killing and making an example of the opponent.
These corporate leaders often have close relations with government officials.
On the other, we want to have close relations with the world," he said.
Many of them have thrived because they have close relations with their national governments.
Sometimes these promoters have close relations with the government officials who monitor their industry.
He is keen to have close relations with Brazil and Argentina, Paraguay's partners in the Mercosur trade block.
Enhanced circulating levels of galectin-3, a proinflammatory cytokine, have close relation to poor prognosis of some inflammatory illnesses.
Results showed that 9 genes: SLC9A3R1, EEF1D, HPLAL1, NDUFS1, SET, EZR, HNRNPK, VCP, and HSP90B1 have close relation with RCC patients' prognosis or metastasis.
More importantly, ITGAV is connected with ADAM9, ANGPTL3, AZGP1, EDIL3, ITGB8, PDGFRA, and SPP1, which have close relation with cell adhesion, cell communication.
From results of this study, subjects are shown to have closer relations between Minfo and Dinfo than that of Minfo and Cinfo.
However, the majority of species found in these floodplain forests seems to have closer relations to the more humid central Amazon.
